Here are MOST REPEATED 30 THEORETICAL QUESTIONS of “Respiration”
📘 Class 10 – CBSE Board
➡️ Converted into MCQ FORMAT
➡️ Year-wise trend mentioned
➡️ Answer Key given at the END
➡️ Designed in exam-attractive & revision-friendly style
🌟 CBSE CLASS 10 – RESPIRATION
🔥 30 MOST REPEATED THEORETICAL MCQs (YEAR-WISE)
Q1. What is respiration?
(a) Intake of oxygen only
(b) Release of carbon dioxide
(c) Breakdown of food to release energy
(d) Breathing process
📅 Asked: 2014, 2018, 2023
Q2. Which of the following best explains aerobic respiration?
(a) Breakdown of glucose without oxygen
(b) Partial oxidation of glucose
(c) Complete oxidation of glucose using oxygen
(d) Release of carbon dioxide only
📅 Asked: 2015, 2019, 2022
Q3. Why is respiration considered an exothermic process?
(a) Energy is absorbed
(b) Energy is released
(c) Oxygen is used
(d) Carbon dioxide is formed
📅 Asked: 2016, 2020
Q4. What happens to pyruvate in absence of oxygen in human muscles?
(a) Converted into ethanol
(b) Converted into lactic acid
(c) Converted into CO₂ and water
(d) Remains unchanged
📅 Asked: 2017, 2023
Q5. Which part of respiration occurs in cytoplasm?
(a) Krebs cycle
(b) Electron transport chain
(c) Glycolysis
(d) Oxidative phosphorylation
📅 Asked: 2018, 2021
Q6. Why are alveoli suitable for gaseous exchange?
(a) Thick walls
(b) Low surface area
(c) Moist surface & rich blood supply
(d) Absence of blood vessels
📅 Asked: 2016, 2019, 2024
Q7. Which statement is TRUE about breathing and respiration?
(a) Both are same
(b) Both release energy
(c) Breathing is physical, respiration is chemical
(d) Respiration occurs only in lungs
📅 Asked: 2015, 2020
Q8. Why is oxygen transported by haemoglobin?
(a) Oxygen is insoluble in plasma
(b) Haemoglobin is acidic
(c) Plasma cannot carry gases
(d) Oxygen diffuses slowly
📅 Asked: 2017, 2022
Q9. What prevents collapse of trachea?
(a) Muscles
(b) Cartilage rings
(c) Alveoli
(d) Diaphragm
📅 Asked: 2014, 2019
Q10. Which factor increases breathing rate during exercise?
(a) Decreased oxygen demand
(b) Increased CO₂ concentration
(c) Decreased ATP usage
(d) Decreased respiration
📅 Asked: 2016, 2021
Q11. What is the role of diaphragm in inhalation?
(a) Moves upward
(b) Moves downward
(c) Remains static
(d) Stops breathing
📅 Asked: 2018, 2023
Q12. Why is anaerobic respiration less efficient?
(a) Uses oxygen
(b) Produces less ATP
(c) Produces more ATP
(d) Releases more energy
📅 Asked: 2015, 2020
Q13. Which gas is produced during respiration in plants at night?
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) Hydrogen
📅 Asked: 2017, 2022
Q14. Why do muscles pain during vigorous exercise?
(a) Oxygen deficiency
(b) Accumulation of lactic acid
(c) Excess glucose
(d) Excess ATP
📅 Asked: 2014, 2019, 2024
Q15. Which blood vessel carries oxygenated blood from lungs?
(a) Pulmonary artery
(b) Pulmonary vein
(c) Vena cava
(d) Aorta
📅 Asked: 2016, 2021
Q16. How does CO₂ get transported in blood mainly?
(a) Dissolved in plasma
(b) As carbamino-haemoglobin
(c) As bicarbonates
(d) Free gas
📅 Asked: 2018, 2023
Q17. Why do plants respire all the time?
(a) To release oxygen
(b) To prepare food
(c) To release energy
(d) To absorb CO₂
📅 Asked: 2015, 2020
Q18. Which structure increases surface area of lungs?
(a) Bronchi
(b) Bronchioles
(c) Alveoli
(d) Trachea
📅 Asked: 2017, 2022
Q19. Why is respiration essential for life?
(a) Produces food
(b) Produces oxygen
(c) Provides energy for life processes
(d) Removes water
📅 Asked: 2016, 2019
Q20. Which step of respiration releases maximum energy?
(a) Glycolysis
(b) Fermentation
(c) Electron transport chain
(d) Pyruvate oxidation
📅 Asked: 2018, 2023
Q21. Which gas exchange method occurs in alveoli?
(a) Active transport
(b) Osmosis
(c) Diffusion
(d) Translocation
📅 Asked: 2014, 2021
Q22. Why is respiration called a cellular process?
(a) Occurs in lungs
(b) Occurs in blood
(c) Occurs in all cells
(d) Occurs in heart
📅 Asked: 2017, 2020
Q23. Which product is common in both aerobic & anaerobic respiration?
(a) ATP
(b) Oxygen
(c) CO₂
(d) Water
📅 Asked: 2016, 2022
Q24. Which organ controls breathing rate?
(a) Cerebrum
(b) Cerebellum
(c) Medulla oblongata
(d) Hypothalamus
📅 Asked: 2018, 2023
Q25. Why is nose preferred for breathing?
(a) Warms air
(b) Filters dust
(c) Moistens air
(d) All of these
📅 Asked: 2015, 2021
Q26. In yeast, anaerobic respiration produces:
(a) Lactic acid
(b) Ethanol and CO₂
(c) Acetic acid
(d) Methane
📅 Asked: 2014, 2019
Q27. Which condition is necessary for aerobic respiration?
(a) CO₂
(b) Nitrogen
(c) Oxygen
(d) Hydrogen
📅 Asked: 2016, 2020
Q28. Why is blood red in colour?
(a) Plasma
(b) Platelets
(c) Haemoglobin
(d) WBC
📅 Asked: 2017, 2022
Q29. Which part connects nasal cavity to lungs?
(a) Larynx
(b) Trachea
(c) Bronchi
(d) Alveoli
📅 Asked: 2015, 2021
Q30. What is the final aim of respiration?
(a) Breathing
(b) Gas exchange
(c) Energy release
(d) Oxygen intake
📅 Asked: 2014, 2018, 2024
✅ ANSWER KEY (1–30)
1-c, 2-c, 3-b, 4-b, 5-c, 6-c, 7-c, 8-a, 9-b, 10-b,
11-b, 12-b, 13-c, 14-b, 15-b, 16-c, 17-c, 18-c, 19-c, 20-c,
21-c, 22-c, 23-a, 24-c, 25-d, 26-b, 27-c, 28-c, 29-b, 30-c
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